LITTELFUSE Teccor brand SK225xD/SK255KD/SK625xD/SK655KD Series SCR switching discrete thyristor devices withstand voltage spikes higher than 1,200V. Devices are unidirectional switches designed to handle voltage spikes and power surges in incoming ac power mains. Products can take up to 1,300V (SK225xD and SK255KD Series) or 1,700V (SK625xD and SK655KD Series) without malfunctioning. Devices are suitable for switching of 50/60Hz ac mains up to 440Vrms. Devices have high repetitive and non-repetitive peak off-stage voltage (VDRM/VDSM) ratings, ensuring reliable operation even when subjected to the high voltage surges. https://twitter.com/littelfuse